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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2504a3a6b2ca6bd402d1bc8679cfec302935284b99c18f06be1e89168695a458' 
  AND token = 'WN1/IV555Tz3kC1OVCGS5hNmDrUT/vnn7VGxcnJpRMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}